iOS 9.9.11.0 (build 15A5370a) is an official Apple over-the-air update for the iPhone 6s, released on 2017-08-31T16:56:18Z. The update package is 1.74 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 73ce35f88260df963d68fe413558ca82d38c16b9.zip.